A 0.5 kg ball was kicked and was going 15 m/s. What is the kinetic energy of the ball?

Explanation:

Kinetic energy can be found using the following formula:

where m is the mass and v is the velocity.

The mass of the ball is 0.5 kilograms and the velocity is 15 meters per second

Substitute the values into the formula.

First, evaluate the exponent.

Multiply 0.5 kg by  225 m²/s²

Multiply 112 kg*m²/s² by 1/2, or divide by 2.

The kinetic energy of the ball is 56.25 Joules

the answer is b, have negligible mass

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me